package apple21181.jdbc;

import java.sql.*;

public class DBTest {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/library_management?useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true";
        String username = "root"; // 你的数据库用户名
        String password = "123456"; // 你的数据库密码

        Connection conn = null;
        PreparedStatement prep = null;
        ResultSet rs = null;

        String name = "admin";
        String pwd = "admin123";
        int uid = 0;
        String uemail = null;

        String sql = "select * from user where username = ? and password = ?";

        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            conn = DriverManager.getConnection(url, username, password);

            prep = conn.prepareStatement(sql);
            prep.setString(1,name);
            prep.setString(2,pwd);
            rs = prep.executeQuery();
            while (rs.next()) {
                uid = rs.getInt("id");
                uemail = rs.getString("email");

            }

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {
            try {
                rs.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
            try {
                prep.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
            try {
                conn.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }

        System.out.println(uid);
        System.out.println(uemail);
    }
}
